variants
or less commonly mollie
plural mollies
: any of various small, often brightly colored tropical fish (genus Poecilia) that are live-bearers found in fresh, brackish, or salt water and include several that are highly valued as aquarium fishes
informal
: the illicit drug ecstasy (see ecstasy sense 2) especially when in a powdered or crystalline form contained in a capsule
Boston Police said Thursday that a dangerously pure form of the drug ecstasy, known as Molly, appeared to be a factor in the mass illnesses the night before at TD Garden, where more than 80 young people attending an electronic dance music concert became sick …—
Evan Allen
Evan AllenExperts say Molly, though often touted as pure, is often mixed with other drugs and ingredients, perhaps even more than the Ecstasy of yesteryear.—Helena Oliveiro
Helena OliveiroCite this Entry
“Molly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/molly. Accessed 4 Nov. 2025.
Copy CitationKids Definition
molly
noun
mol·ly
variants
also mollie
plural mollies
: any of several often colorful small fishes that are often kept in tropical aquariums
Medical Definition
Molly
noun
Mol·ly
ˈmä-lē 
: the illicit drug ecstasy especially when in a powdered or crystalline form contained in a capsule
Experts say Molly, though often touted as pure, is often mixed with other drugs and ingredients, perhaps even more than the Ecstasy of yesteryear.—Helena Oliveiro, The Atlanta Journal-Constitution
Helena Oliveiro, The Atlanta Journal-ConstitutionLove words? Need even more definitions?
Merriam-Webster unabridged
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